1
CREATE TABLE t1(id INT);
2
INSERT INTO t1 VALUES (1),(2),(3),(4);
3
INSERT INTO t1 SELECT a.id FROM t1 a,t1 b,t1 c,t1 d;
4
SET SESSION debug="d,subselect_exec_fail";
5
SELECT SUM(EXISTS(SELECT RAND() FROM t1)) FROM t1;
6
SUM(EXISTS(SELECT RAND() FROM t1))
8
SELECT REVERSE(EXISTS(SELECT RAND() FROM t1));
9
REVERSE(EXISTS(SELECT RAND() FROM t1))
11
SET SESSION debug=DEFAULT;